diff --git a/v2.0/LetsEncrypt/App.cs b/v2.0/LetsEncrypt/App.cs
index b26c86b..30cdf27 100644
--- a/v2.0/LetsEncrypt/App.cs
+++ b/v2.0/LetsEncrypt/App.cs
@@ -1,13 +1,16 @@
 using System;
 using System.IO;
+using System.Linq;
+
+using System.Threading;
 using System.Threading.Tasks;
 using System.Collections.Generic;
 
-using System.Linq;
+
 
 using Microsoft.Extensions.Options;
 
-using Mono.Unix;
+
 
 using LetsEncrypt.Services;
 using LetsEncrypt.Helpers;
@@ -32,7 +35,7 @@ namespace LetsEncrypt
         }
 
         public void Run() {
-            _appSettings.environments.Where(env => env.active).ToList().ForEach(env => {
+            foreach(var env in _appSettings.environments.Where(env => env.active)) {
                 try {
                     Console.WriteLine(string.Format("Let's Encrypt C# .Net Core Client, environment: {0}", env.name));
         
@@ -189,10 +192,9 @@ namespace LetsEncrypt
                 }
                 catch (Exception ex) {
                     Console.WriteLine(ex.Message.ToString());
+                    break;
                 }
-            });
-
-            
+            }
         }
     }
 }
diff --git a/v2.0/LetsEncrypt/Entities/LetsEncrypt/Jwk.cs b/v2.0/LetsEncrypt/Entities/LetsEncrypt/Jwk.cs
index ef132df..c941659 100644
--- a/v2.0/LetsEncrypt/Entities/LetsEncrypt/Jwk.cs
+++ b/v2.0/LetsEncrypt/Entities/LetsEncrypt/Jwk.cs
@@ -1,10 +1,12 @@
+// https://tools.ietf.org/html/rfc7517
+
 using System;
 using Newtonsoft.Json;
 
 
 namespace LetsEncrypt.Entities
 {
-      public class Jwk
+    public class Jwk
     {
         /// <summary>
         /// "kty" (Key Type) Parameter
diff --git a/v2.0/LetsEncrypt/Services/JwsService.cs b/v2.0/LetsEncrypt/Services/JwsService.cs
index 859ab00..b7d23e6 100644
--- a/v2.0/LetsEncrypt/Services/JwsService.cs
+++ b/v2.0/LetsEncrypt/Services/JwsService.cs
@@ -1,4 +1,9 @@
-using System;
+/**
+* https://tools.ietf.org/html/rfc4648
+* https://tools.ietf.org/html/rfc4648#section-5
+*/
+
+using System;
 using System.Security.Cryptography;
 using System.Text;
 using Newtonsoft.Json;
@@ -31,8 +36,7 @@ namespace LetsEncrypt.Services
 
             var publicParameters = rsa.ExportParameters(false);
 
-            _jwk = new Jwk
-            {
+            _jwk = new Jwk () {
                 KeyType = "RSA",
                 Exponent = Base64UrlEncoded(publicParameters.Exponent),
                 Modulus = Base64UrlEncoded(publicParameters.Modulus),
@@ -112,6 +116,7 @@ namespace LetsEncrypt.Services
             return Base64UrlEncoded(Encoding.UTF8.GetBytes(s));
         }
 
+        // https://tools.ietf.org/html/rfc4648#section-5
         public string Base64UrlEncoded(byte[] arg)
         {
             var s = Convert.ToBase64String(arg); // Regular base64 encoder
diff --git a/v2.0/LetsEncrypt/Services/LetsEncryptService.cs b/v2.0/LetsEncrypt/Services/LetsEncryptService.cs
index 43965bd..979f674 100644
--- a/v2.0/LetsEncrypt/Services/LetsEncryptService.cs
+++ b/v2.0/LetsEncrypt/Services/LetsEncryptService.cs
@@ -1,5 +1,4 @@
 /**
-* tools.itef.org/html/draft-itef-acme-acme-18
 * https://community.letsencrypt.org/t/trying-to-do-post-as-get-but-getting-post-jws-not-signed/108371
 * https://tools.ietf.org/html/rfc8555#section-6.2
 * 
@@ -100,7 +99,6 @@ namespace LetsEncrypt.Services {
             // 1 - Get directory
             (_directory, _) = await SendAsync<AcmeDirectory>(HttpMethod.Get, new Uri("directory", UriKind.Relative), null, token);
 
-
             if (File.Exists(_path))
             {
                 bool success;
@@ -420,8 +418,7 @@ namespace LetsEncrypt.Services {
         /// </summary>
         /// <param name="token"></param>
         /// <returns></returns>
-        public async Task KeyChange(CancellationToken token = default(CancellationToken))
-        {
+        public async Task KeyChange(CancellationToken token = default(CancellationToken)) {
 
         }
 
@@ -431,8 +428,7 @@ namespace LetsEncrypt.Services {
         /// </summary>
         /// <param name="token"></param>
         /// <returns></returns>
-        public async Task RevokeCertificate(CancellationToken token = default(CancellationToken))
-        {
+        public async Task RevokeCertificate(CancellationToken token = default(CancellationToken)) {
 
         }